$ cd 2015
cd stands for "change directory". Just as you would click on a folder in Windows Explorer or Finder,
cd switches you into the directory you specify. In other words,
cd changes the working directory.
- The directory we change into is
2015. When a file, directory or program is passed into a command, it is called an argument. Here the 2015 directory is an argument for the
cd command takes a directory name as an argument, and switches into that directory.